Chapter 42 Configuring PFC QoS

Common QoS Scenarios

The difference between this policer configuration and the marking configuration is the policy-map action statements. The marking example uses the set dscp command to mark the traffic with a particular DSCP value. This policing example marks the CLASSIFY-OTHER traffic to a DSCP value of zero and polices that traffic to 50 Mbps. To do this, replace the set dscp command with a police command. The police command allows a marking action to take place: it marks all traffic below the 50 Mbps limit to DSCP 0 and drops any traffic above the 50 Mbps threshold.

This is the modified IPPHONE-PC policy map, which includes the police command:

policy-map IPPHONE-PC class CLASSIFY-OTHER

police 50000000 1562500 conform-action set-dscp-transmit default exceed-action drop

These are the police command parameters:

•The 50000000 parameter defines the committed information rate (CIR) for traffic allowed in this traffic class. This example configures the CIR to be 50 Mbps.

•The 1562500 parameter defines the CIR burst size for traffic in this traffic class; this example uses a default maximum burst size. Set the CIR burst size to the maximum TCP window size used on the network.

•The conform action keywords define what the policer does with CLASSIFY-OTHER packets transmitted when the traffic level is below the 50Mbps rate. In this example, set-dscp-transmit default applies DSCP 0 to those packets.

•The exceed action defines what the policer does with CLASSIFY-OTHER packets transmitted when the traffic level is above the 50 Mbps CIR. In this example, exceed action drop drops those packets.

This is a basic example of a single rate per-interface aggregate policer. The Supervisor Engine 2 and Supervisor Engine 720 forwarding engines also support a dual-rate policer for providing both CIR and peak information rate (PIR) granularity.

Attach the policy map to the appropriate interface using the service-policy input command:

interface FastEthernet5/1 service-policy input IPPHONE-PC

To monitor the policing operation, use these commands:

show policy-map interface fastethernet 5/1

show class-map

show mls qos ip fastethernet 5/1

 

 

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OL-4266-08 specifications

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In conclusion, Cisco Systems OL-4266-08 equips networking professionals with the necessary skills to implement and support Cisco collaboration solutions. The focus on hands-on experience, along with in-depth coverage of technology and security protocols, makes it a valuable certification in the fast-paced world of network communications. With the rise of remote work and digital collaboration, this certification is pivotal for anyone looking to enhance their career in networking and technology.
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